Table 5

Categorization of algorithm false negatives by PHI type on test corpus.

PHI Type

# False negatives in 296,400 words/1,836 nursing notes

# False negatives per 100,000 words

Recall


Full name

4 †

1


Last name

14 †

5


First name

31 †

11


Location (not street address)

7

2


Full date

2

1

Unknown


Partial date

9

3


Year

8

3


Age over 89

3

1


Overall

78

27

0.94 (estimated)


† None of these names were actually patient names, and therefore were non-critical PHI.

Neamatullah et al. BMC Medical Informatics and Decision Making 2008 8:32   doi:10.1186/1472-6947-8-32

Open Data